Optical Properties of Co_3O_4-Doped ZnO-B_2O_3-SiO_2-Al_2O_3 Glass System for a Transparent Dielectric Layer

摘要

There has been a need to improve color temperature without using asymmetric cell structures using transparent dielectric layers with variation of Co_3O_4 contents in plasma display panel (PDP). In this study, ZnO-B_2O_3-SiO_2-Al_2O_3 glasses with variations of the Co_3O_4 content (0, 0.5, 1.0, 1.5, and 2.0 wt%) were fabricated and the optical properties of these glasses were characterized. As the content of Co_3O_4 increased, the transmittance of the red region (from 580 to 780 nm) decreased more than of the blue region (from 380 to 500 nm). This change of transmittance induced the transition of the coordination of the color temperature toward the blue region. Therefore, the addition of 2 wt% Co_3O_4 can improve the color temperature from 6087 to 7378 K and the result was confirmed using simulation.